Effect analysis on regeneration speed of continuous regeneration-diesel particulate filter based on NO2-assisted regeneration

摘要

In order to improve the regeneration speed of Continuous Regeneration-Diesel Particulate Filter (CR-DPF) based on NO2-assisted regeneration, a mathematic model of the NO2-assisted regeneration is developed and verified by experiments and numerical simulation. Furthermore, the influences on regeneration speed from exhaust airflow and filter structure are studied in NO2-assisted regeneration process of CR-DPF. The results show that: the regeneration speed will be increased due to the increase of the volume of the exhaust gas, the temperature of the exhaust gas, the concentration of the NO2 and the concentration of the O2 in exhaust gas, but the regeneration speed will be decreased under other conditions such as m(NO2)/m(PM) being less than its threshold in exhaust gas, the increase of the filter length in CR-DPF or the increase of the channel density when initial amount of the carbon particles in filter being less than its threshold, moreover, thickness of channel wall has no effect on regeneration speed. And the suitable range of values for some key parameters being useful for enhancing regeneration speed and reducing pressure drop of CR-DPF has been provided.